aliapp-demo/page/API/file/file.axml

<view class="container">
  <view class="page-body">
    <view class="page-body-wrapper">
      <view class="page-body-info">
        <text class="page-body-text-small">请选择图片</text>
        <block a:if="{{tempFilePath != ''}}">
          <image src="{{tempFilePath}}" class="image"></image>
        </block>
        <block a:if="{{tempFilePath === '' && savedFilePath != ''}}">
          <image src="{{savedFilePath}}" class="image"></image>
        </block>
        <block a:if="{{tempFilePath === '' && savedFilePath === ''}}">
          <view class="image-plus" onTap="chooseImage">
            <view class="image-plus-horizontal">
              <view class="image-plus-vertical"></view>
            </view>
          </view>
        </block>
      </view>
      <view class="page-body-buttons">
        <button class="page-body-button" type="primary" onTap="saveFile">保存文件</button>
        <button class="page-body-button" onTap="clear">删除文件</button>
      </view>
    </view>
  </view>
</view>